{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "76c56a5affeba1e163b66b9d8cc192e6154466f0"
            },
            {
              "fixed": "96f7de3172d4aa878b7f87173b2b3507c350fcd6"
            },
            {
              "fixed": "bc573752f3dac0d1ab8df7078c1851bc76717653"
            },
            {
              "fixed": "1fb565b77b8f44afabb02de6310065f109d89e94"
            },
            {
              "fixed": "a321c908f2eeea01539668eb270d074d9b88e490"
            },
            {
              "fixed": "9c698b2c43c2667c34f5336bf46ad5786216ac2a"
            },
            {
              "fixed": "8a114b25b5521eae451b13bce98ae978624962e5"
            },
            {
              "fixed": "13d33b9ef67066c77c84273fac5a1d3fde3533d1"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.14.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.93"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.35"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64524.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/hyperv: validate resolution_count and fix WIN8 fallback\n\nA SYNTHVID_RESOLUTION_RESPONSE with resolution_count \u003e 64 walks past\nthe supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT] array in the\nparse loop. Bound resolution_count against the array size, folded\ninto the existing zero-check.\n\nWhen the WIN10 resolution probe fails, the caller in\nhyperv_connect_vsp() left hv-\u003escreen_*_max / preferred_* unpopulated,\nwhich sets mode_config.max_width / max_height to 0 and makes\ndrm_internal_framebuffer_create() reject every userspace framebuffer\nwith -EINVAL. The pre-WIN10 branch had the same gap for\npreferred_width / preferred_height. Use a single post-probe fallback\nguarded by screen_width_max == 0 so both paths converge on the WIN8\ndefaults.",
  "id": "CVE-2026-64524",
  "modified": "2026-07-28T03:55:46.784233673Z",
  "published": "2026-07-25T09:20:48.193Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/13d33b9ef67066c77c84273fac5a1d3fde3533d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1fb565b77b8f44afabb02de6310065f109d89e94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a114b25b5521eae451b13bce98ae978624962e5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96f7de3172d4aa878b7f87173b2b3507c350fcd6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c698b2c43c2667c34f5336bf46ad5786216ac2a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a321c908f2eeea01539668eb270d074d9b88e490"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc573752f3dac0d1ab8df7078c1851bc76717653"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64524.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64524"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "drm/hyperv: validate resolution_count and fix WIN8 fallback"
}